On 05/10/2017 12:10, Anthony K wrote: > It might require a vgexport then vgimport to fix. > On 03/10/2017 21:28, Gordon Messmer wrote: > > Is /etc/mdadm.conf up to date? Run "mdadm --detail --scan" to get the > information you need, and either replace the lines in mdadm.conf or > add the one that's missing. You might need to rebuild the initrd > afterward (dracut --force). I'm unclear on why any of that would be > necessary, though. I don't usually add pre-existing arrays to running > systems, so I'm a bit out of my experience here. Thanks for the replies both I'd already tried both those ideas before posting, I should have mentioned In the end what fixed it was copying over the lvm.conf from the old system backup, and rebuilding the initrd I didn't think to diff the two before hand so not sure what it was that changed, but sorted now anyway! thanks again Duncan